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'''
Task Coach - Your friendly task manager
Copyright (C) 2011 Task Coach developers <developers@taskcoach.org>
Task Coach is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Task Coach is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
# inotify wrapper from this recipe: http://code.activestate.com/recipes/576375-low-level-inotify-wrapper/
# Slightly modified to handle timeout and use select(); cleanup error handling
import os, threading, time, select
from struct import unpack
from fcntl import ioctl
from termios import FIONREAD
from time import sleep
from ctypes import cdll, create_string_buffer, c_int, POINTER
from errno import errorcode
from taskcoachlib.filesystem import base
libc = cdll.LoadLibrary('libc.so.6')
libc.__errno_location.restype = POINTER(c_int)
def geterr():
return errorcode[libc.__errno_location().contents.value]
class Inotify(object):
def __init__(self):
self.fd = libc.inotify_init()
if self.fd == -1:
raise OSError('inotify init: %s' % geterr())
self.fd_read, self.fd_write = os.pipe()
self.lock = threading.RLock()
def do_read(self, fd):
size_int = c_int()
ioctl(fd, FIONREAD, size_int)
size = size_int.value
if size:
return os.read(fd, size), size
return None, 0
def read(self, timeout=None):
self.lock.acquire()
try:
result = []
fds, _, _ = select.select([self.fd, self.fd_read], [], [], timeout)
if self.fd in fds:
data, size = self.do_read(self.fd)
if size:
deb = 0
while deb < size:
fin = deb + 16
wd, mask, cookie, name_len = unpack('iIII', data[deb:fin])
deb, fin = fin, fin+name_len
name = unpack('%ds' % name_len, data[deb:fin])
name = name[0].rstrip('\0')
deb = fin
result.append((wd, mask, cookie, name))
if self.fd_read in fds:
self.do_read(self.fd_read)
return result
finally:
self.lock.release()
def stop(self):
os.write(self.fd_write, 'X')
def add_watch(self, path, mask):
os.write(self.fd_write, 'X')
self.lock.acquire()
try:
wd = libc.inotify_add_watch(self.fd, path, mask)
if wd == -1:
raise OSError('inotify add_watch: %s' % geterr())
return wd
finally:
self.lock.release()
def rm_watch(self, wd):
os.write(self.fd_write, 'X')
self.lock.acquire()
try:
ret = libc.inotify_rm_watch(self.fd, wd)
if ret == -1:
raise OSError('inotify rm_watch: %s' % geterr())
finally:
self.lock.release()
def close(self):
os.close(self.fd)
os.close(self.fd_read)
os.close(self.fd_write)
FLAGS = {
'ACCESS' : 0x00000001, # IN_ACCESS
'MODIFY' : 0x00000002, # IN_MODIFY
'ATTRIB' : 0x00000004, # IN_ATTRIB
'WRITE' : 0x00000008, # IN_CLOSE_WRITE
'CLOSE' : 0x00000010, # IN_CLOSE_NOWRITE
'OPEN' : 0x00000020, # IN_OPEN
'MOVED_FROM' : 0x00000040, # IN_MOVED_FROM
'MOVED_TO' : 0x00000080, # IN_MOVED_TO
'CREATE' : 0x00000100, # IN_CREATE
'DELETE' : 0x00000200, # IN_DELETE
'DELETE_SELF' : 0x00000400, # IN_DELETE_SELF
'MOVE_SELF' : 0x00000800, # IN_MOVE_SELF
'UNMOUNT' : 0x00002000, # IN_UNMOUNT
'Q_OVERFLOW' : 0x00004000, # IN_Q_OVERFLOW
'IGNORED' : 0x00008000, # IN_IGNORED
'ONLYDIR' : 0x01000000, # IN_ONLYDIR
'DONT_FOLLOW' : 0x02000000, # IN_DONT_FOLLOW
'MASK_ADD' : 0x20000000, # IN_MASK_ADD
'ISDIR' : 0x40000000, # IN_ISDIR
'ONESHOT' : 0x80000000, # IN_ONESHOT
}
def mask_str(mask):
return ' | '.join(name for name, val in FLAGS.items() if val & mask)
class FilesystemNotifier(base.NotifierBase, threading.Thread):
def __init__(self):
super(FilesystemNotifier, self).__init__()
self.wd = None
self.notifier = Inotify()
self.cancelled = False
self.lock = threading.RLock()
self.setDaemon(True)
self.start()
def run(self):
try:
while not self.cancelled:
self.lock.acquire()
try:
myName = self._filename
finally:
self.lock.release()
if myName is not None:
myName = myName.encode('UTF-8')
events = self.notifier.read()
for _, _, _, name in events:
if name == os.path.split(myName)[-1]:
if self._check(myName) and myName:
self.stamp = os.stat(myName).st_mtime
self.onFileChanged()
break
except TypeError:
# Interpreter termination (we're daemon)
pass
except:
import traceback
traceback.print_exc()
def setFilename(self, filename):
if self.notifier is not None:
self.lock.acquire()
try:
if self.wd is not None:
self.notifier.rm_watch(self.wd)
self.wd = None
super(FilesystemNotifier, self).setFilename(filename)
if self._filename:
self.wd = self.notifier.add_watch(self._path.encode('UTF-8'),
FLAGS['MODIFY']|FLAGS['MOVED_TO'])
finally:
self.lock.release()
def stop(self):
if self.notifier is not None:
self.cancelled = True
self.notifier.stop()
self.join()
self.notifier.close()
self.notifier = None
def onFileChanged(self):
raise NotImplementedError
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